For individual key custody solutions for staking Ethereum we recommend 1password.
Securing your nodes means keeping your
- key file
- wallet password
- seed phrases
Safe, most important of these is the seed phrase that relates to your node. This Metamask article explains why. Our recommendations for people running under 100 nodes are for highly secure, competent and established password managers that provide individual and enterprise solutions for storing passwords, secrets and keys, that have been tested over time with a broad range of use cases. We also think these vendors have user interfaces and workflows that are easy to use and manage over time and multiple devices.